Direct connect HS

Based on your existing phone type, this page recommend "Packaged headset" fit to your particular phone type and model.
Packaged headset is the set of " a quick disconnect headset + an appropriate cord(RJ-9 modular, USB , 2.5 mm) or an Amplifier". Package also gives a price benefit. All you need to do is choose the headset style you like (headband, ear hook) and whether you need the noise canceling microphone or a voice tube headset. You no longer have to figure out which cable you need for the phone you have.